I am using Mongoose to connect to MongoDB. While testing my code with Jest, the tests passed but never terminated.

In my mongoDB.service.ts I have:

  private connections: Map<number, Connection> = new Map();
  private connection: Connection;

Because I want to connect multiple dbs.
I use the connection to set the db connection and add it to the connections map

this.connection.useDb(dbName);

I implemented OnApplicationShutdown:

async onApplicationShutdown(): Promise<void> {
    for (const [orgId, connection] of this.connections) {
      await connection
        .close()
        .then(() => {
          console.log(`Connection for organization ID ${orgId} closed.`);
        })
        .catch((e) => {
          console.error(`Failed to close connection for organization ID ${orgId}: ${e}`);
        });
    }
    this.connections.clear();
    await this.connection
      .close()
      .then(() => {
        console.log("Secondary MongoDB connection closed.");
      })
      .catch((e) => {
        console.error(`Failed to close secondary MongoDB connection: ${e}`);
      });
    await mongoose.connection
      .close()
      .then(() => {
        console.log("Primary MongoDB connection closed.");
      })
      .catch((e) => {
        console.error(`Failed to close primary MongoDB connection: ${e}`);
      });
  }

In my tests I have afterAll():

  afterAll(async () => {
    await module.close();
  }, 60000);

I debugged it, and it seems that the connections are closed. However, the tests never terminated.
I know it has been asked before MongoDB connections do not close in test scenarios, but never answered.

How to solve it?